步态活动取决于肢体伸展和脊髓挫伤啮齿动物的相位:对机器人步态训练和评估的影响

J. Nessler, K. Minakata, K. Sharp, D. Reinkensmeyer
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引用次数: 6

摘要

本研究的目的是研究脊髓挫伤大鼠在机器人辅助下后肢伸展时的运动活动。19只大鼠的中胸脊髓受到挫伤。我们使用了一个机器人步态训练装置(“老鼠步”)和一个机器人爪子平台(“滑块”)来拉伸动物的后肢。与没有机器人辅助的跑步机将其后肢拉伸(38.9+/-16.6%)相比,在常规跑步机上,当大鼠踏步者将其后肢拉伸时,受伤大鼠开始摇摆的概率(p < 0.001)显著增加(75+/-16.9%)。此外,与同时伸展两条后肢相比,使用大鼠步器伸展一条后肢并保持另一条后肢站立会导致更多的单侧踏步,而不是双侧跳跃活动(81 /spl plusmn/0.24%比43/spl plusmn/0.34%, p < 0.001)。与使用传统跑步机训练相比,在两分钟的训练时间内,每个损伤组中有一只动物使用机器人辅助伸展和适当的肢间分阶段训练(平均84步对平均12步)。这些结果表明,通过适当的分阶段、机器人辅助的动物后肢伸展,可以引发更多的交替行走活动,从而为脊髓损伤后的步态评估和训练提供可能的好处。
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Gait activity depends on limb extension and phasing in spinal cord contused rodents: implications for robotic gait training and assessment
The purpose of this study was to investigate the locomotor activity of spinal cord contused rats in response to robot-assisted extension of their hindlimbs. Nineteen rats received a contusion injury to the mid-thoracic spinal cord. We used a robotic gait-training device ("the rat stepper") and a robotic paw platform (the "slide") to pull the animals' hindlimbs into extension. The injured rats initiated swing with a significantly greater probability (p < 0.001) when the rat stepper pulled their hindlimbs into extension on a conventional treadmill (75+/-16.9%) as compared to the treadmill pulling their hindlimbs into extension with no robotic assistance (38.9+/-16.6%). Furthermore, using the rat stepper to extend one hindlimb and hold the other in stance while on the slide resulted in more unilateral stepping, rather than bilateral hopping activity, when compared to the extension of both hindlimbs simultaneously (81 /spl plusmn/0.24% vs. 43/spl plusmn/0.34%, p < 0.001). Continuous training of one animal from each injury group with robot-assisted extension and appropriate interlimb phasing using the rat stepper and slide yielded substantially more steps in a two-minute training period when compared to training with a conventional treadmill (84 steps on average vs 12 steps on average). These results indicate that a greater amount of alternating stepping activity can be elicited by appropriately-phased, robot-assisted extension of an animal's hindlimb, thereby providing possible benefits to evaluation and training of gait following SCI.
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